1. Lectures on n-Dimensional Quasiconformal Mappings;Väisälä,1971
2. The coefficients of quasiconformality of domains in space;Gehring;Acta Math.,1965
3. Quasiconformal mappings of slit domains in three-space;Gehring;J. Math. Mech.,1969
4. Univalent functions and the Schwarzian derivative;Gehring;Comment. Math. Helv.,1977
5. Characteristic Properties of Quasidisks;Gehring,1982